Roadbed for railways



Feb. 19, 1929. 1,702,841

M. RUPING ROADBED FOR RAILWAYS Filed NOV. 22, 1927 CHI I Inventor:

Patented Feb. 19, 1929.

UNITED STATES;

PATENT OFF-ICE.

MAX unner, or MUNICH, GERMANY.

ROADBED r'on .RAILWAYS. 7

Application filed November 22, 1927, Serial 80. 235,047, and in Germany February 16, 1927.

This invention has reference to road beds for railways, and it is intended to devise means of producing a very durable and resisting surface-superstructure and to obtain other important objects which will appear from the specification and drawing. In the construction of roadbeds, as heretofore employed, a layer of coarse gravel, ballast or pebble ispla'ced upon the bottom or foundation,"the ties for'supporting the rails being embedded in such layer. With certain kinds of soils, such as for'instancein the case of loamy soils there is the difliculty thatthe bottom or foundation on account of the atmospheric influences, rainfall, snow andthelike is softened below the tie and yields, and that the soil which is forced sideways from underneath the ties is subject to swelling. The formation of ruts thereby produced inview of the fact that the water will accumulate and stay in these ruts and depressions is an Now in accordance with this invention these difliculties are overcome by first placing a layer of coarse gravel, pebble or ballast on the bottom, such layer being pounded or rolled in the well known manner, whereupon a filler, such as sand for instance, is incorporated with a supply of water with said layer. By means of the rolling in and the subsequent rinsing in of the sand this layer of ballast or the like becomes sufiiciently resistant and impervious against the atmospheric discharges. Also the supporting capacity of such layer is considerably increased as compared with the unfilled layers of ballast or gravel. Upon the rolled and subsequently filled layer of ballast or gravel it is preferable to place loose gravel or ballast, in order to allow of the adjustment of the structure formed by the ties andthe rails'mounted thereon and of the proper levelling thereof. The ballast or gravel employed for the loose layer of gravelshould be sufiiciently coarse to not interfere with the lateral flowing off of the atmospheric discharges upon the surface of the sand-filled layer of ballast, gravel or the like. This kind of construction of the railroad bed is likewise possible without difiiculty and at low expense in the case of ex isting railroads. Whenever required, the pounded 0r packed layer of ballast or gravel into which as above mentioned they sand is incorporated by washing may be provided with a watertight covering, such as tar, bitumen, crude petroleum,petroleum-residues, asphaL. tum or the like. This additional safetymeans. will be preferably only employed below the rail joints in the case of normal railroads onaccount of the increased expenses.

The invention will be further described-by reference to the accompanying drawing" illustrating by way of example an embodiment ofthe principles of the invention in Figure 1 in longitudinal section, and-in Figure 2 one somewhat reduced scale in transverse section,

the-bottom or foundation a and is consolidated by rolling down. After the rolling an amount of sand is washed in into this layer of ballast b, the sand filling the interstices of the rolled layer of gravel or ballast. This layer presents already a considerable degree while Fig. 3 is a transverse. section showing a of imperviousness to water, so that if desired,

it may sufiice for the protection of the bottom a against atmospheric discharges without additional means. In the embodiment herein shown byway of exemplification, however,

railsf mounted thereon, and which moreover does not prevent lateral flowing oflf of the water. With the construction accordin to this invention the undisturbed position 0 the track is secured, and the costs of mainte-' name are considerably decreasedas compared with theprev'ious constructions. The layer of gravel or ballast may even be reduced, if

desired, as distinguished from the arrangements of the previous art. 1 1

Having thus described my'invention' it will be understood that it is not to be restricted to the exemplification shown, but initsbroad aspects admits of modifications and' changes,

' except as otherwise appears from the appended claims.

I claim 1. A road bed for railroads comprising a water impermeable lower layer consistingol tightly packed gravel like material having;

the interstices thereof filled with sand" and an upper layer of loose gravel like material in which the ties are set superposed on said lower layer.

2. A road bed for railways comprising a water impermeable lower layer, an; upper layer of'loose' graveldike material in which the ties are set and. an intermediate layer of altar-likematerial. V

3.. A road bed for railroads as claimed in claim. 1- and in. combinationtherewith. of an intermediate layer of a tar-likematerial'.

4.. A; method, of makingroad beds for railroads comprising tightly compressing a1 layer ofgravcl-lilre material, filling'th'e interstices of said layer with a filler of a similarbut' liner material and superposingon said layer a layer'of loose ballast.

5; A method as claimed in claim 4: inwhich the filler of finer material is mixed with water and 1n a fluid conditlon is washed into the interstices oi the lower layer.- s

A method oi": making road beds for railroads comprising tightly compressing a layer oi gravel-litre material, filling the interstices of said layer with a filler o1": sandand superposing' on said layer a layer of loose ballast.

7; A method as claimed in claim 6 in which the filler oi' sandis mixed withwater and in a fluid condition is washed into the interstices of the lowerlayer.

8; A method of makingread bedsof railroads comprising compacting a: layer of hal last, filling the interstices in said; compacted ballast with a filler otsand, covering said layer with alayer of a tar-likesubstance and super-posing said last-named layer. withila layer ofloose ballast inwhich the-ties areset;

9. Amethod as. claimed in claim? in which the filler. of sandals IIICOFPOP-fltbfhlll said ballast by mixing: said sand with water 'andfiow ing said mixture intosaid layer. i

Intestimony whereof! allixlmy signature:

Bernie; 

